12 Lyncis

12 Lyncis, abbreviated 12 Lyn, is a triple star[8] system in the constellation Lynx. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.87. When seen through a telescope, it can be separated into three stars: two components with magnitudes 5.4 and 6.0 that lie at an angular separation by 1.8″ (as of 1992) and a yellow-hued star of magnitude 7.2 at a separation of 8.6″ (as of 1990).[9][10] The orbit of the two brighter stars is not known with certainty, but appears to have a period of somewhere around 700 to 900 years.[11] The pair have a projected separation of 128 AU.[4] Parallax indicates the system is 210±10 light years distant from Earth.[1]

12 Lyn
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension  06h 46m 14.13019s[1]
Declination +59° 26′ 30.0227″[1]
Apparent magnitude (V) 4.86[2] (5.44 / 6.00)[3]
Characteristics
Evolutionary stage A3V[2] (A1.5V + A2V)[4]
U−B color index +0.08[5]
B−V color index +0.084±0.012[2]
Astrometry
Radial velocity (Rv)−3.0±4.2[6] km/s
Proper motion (μ) RA: −19.63[1] mas/yr
Dec.: −7.23[1] mas/yr
Parallax (π)15.19 ± 0.78[1] mas
Distance210 ± 10 ly
(66 ± 3 pc)
Absolute magnitude (MV)0.77[2]
Orbit[3]
Period (P)907.6 yr
Semi-major axis (a)2.30″
Eccentricity (e)0.3700
Inclination (i)134.7°
Longitude of the node (Ω)166.5°
Periastron epoch (T)B 2677.4
Argument of periastron (ω)
(secondary)		322.6°
Details
12 Lyn A
Radius2.52[4] R☉
Rotational velocity (v sin i)90±30[4] km/s
12 Lyn B
Radius2.44[4] R☉
Rotational velocity (v sin i)100±30[4] km/s
Other designations
12 Lyn, BD+59°1015, GC 9850, HD 48250, HIP 32438, HR 2470, SAO 25939, WDS 06462+5927[7]
Database references
SIMBAD12 Lyn
12 Lyn A
12 Lyn B

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Archived from the original on 2016-04-02.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 28 May 2017.
  4. Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x.
  5. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4. Bibcode:1966CoLPL...4...99J.
  6. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. "* 12 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 November 2012.
  8. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  9. Mason, Brian D.; et al. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  10. Monks, Neale (2010). Go-To Telescopes Under Suburban Skies. New York, New York: Springer Science & Business Media. p. 56. ISBN 9781441968517.
  11. Malkov, O. Yu.; Tamazian, V.S.; Docobo, J.A.; Chulkov, D.A. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy and Astrophysics. 546: 5. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. A69.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.